Final answer:
Erin likely has low self-esteem, which is often associated with detrimental behaviors such as drug use, self-harm, and risky sexual activities. Low self-esteem can stem from late puberty and the subsequent poor self-image and feeling inferior to peers.
Step-by-step explanation:
Erin's behaviors such as using drugs, self-harming, and engaging in risky sexual activities are indicative of low self-esteem. It's important for parents to be aware that teenagers with low self-esteem are more likely to engage in other unhealthy behaviors such as smoking, drinking alcohol, and early involvement in sexual activity. Additionally, teenagers going through late puberty may compare themselves with peers who have already matured, which can lead to feelings of physical inferiority, poor body image, and consequently, low self-esteem.